Hello All,
Till Kubuntu 7.04, multimedia support for audio and video was added post installation by simply installing the package 'libxine-extracodecs' and 'libdvdcss'.
Now in Kubuntu 7.10 gutsy, the package libxine-extracodecs is no longer present. The website https://wiki.kubuntu.org/GutsyGibbon/RC/Kubuntumentions a package called 'kubuntu-restricted-extras' to be installed for multimedia support. I had already installed 'libdvdcss' and 'w32codecs' but Kaffeine would not play avi and mp4 files. VLC player was playing these files but I could not control brightness and contrast in VLC. After installing the package 'kubuntu-restricted-extras' via apt, I am able to play these files in Kaffeine too.
For bluetooth in Kubuntu 7.10, nothing has to be installed. simply run 'sudo /etc/init.d/bluetooth start' and it will start the service and place the bluetooth icon in the system tray. The bluetooth adapter was the 'Enter' one which I had bought recently. I tried a nokia N82 phone. I double-clicked on the bluetooth icon in the taskbar and Konqueror opened up with an icon of a wired telephone handset and n82 as its label. To enter this I had to set a password in the mobile and in the popup window on computer. Then on clicking 'OBEX File Transfer' I got 2 folders C and E. C was the mobile's memory and E was the external 2 GB memory. Every time I tried to enter a folder, the phone would ask whether to accept the connection or not. To eliminate that, the computer was 'authorised' in the phone's settings. Connection speed is 45 to 50 Kbytes/sec only but this may be a limitation of the phone's hardware. I haven't tried it in windows.